Experimental optimization of concatenated taper Mach-Zehnder interferometers operating in the 1000-1150  nm...

Experimental optimization of all fiber Mach-Zehnder interferometers based on concatenated tapers is presented. The experimental optimization was realized by the application of the four parameters Taguchi algorithm, and the insertion loss of comb filters operating around the 1064 nm wavelength was taken as the parameter to be optimized. The out of band losses were reduced from around 2.5 dB (43.7%) to a minimum of 0.45 dB (9.84%) in one case, and from 2.9 (48.71%) to 0.4 dB (8.79%) by using a fixed tapers pair's geometry with 1  mm×1  mm×1  mm of up-taper length/waist length/down-taper length, respectively, and a waist diameter of 40 μm.